It’s been 20 years since Epic Games first released its Unreal game development engine in concert with its first person shooter, Unreal. Since then, the company has been releasing free-to-play games as a loss leader to show off what its powerful development toolkit can do.

Now, with the insane success of Fortnite, the company has flipped the script.

The company’s game has become the kind of old-school cultural phenomenon that one rarely sees in the fractured age of internet silos. It’s inspired dance crazes, Halloween costumes, and even a Monopoly game and a Nerf gun.